oxidation of gaseous CIF by F2 yields liquid CIF3. Use the following thermochemical equation to calculate delta H reaction for the production of CIF3
1) 2 CIF (g) + O2 (g) --> Cl2O (g) + OF2 (g) delta H = 167.5
2) 2 F2 (g) + O2 (g) --> 2 OF2 (g) delta H = -43.4
3) 2CIF3 (l) + 2O2 (g) --> Cl2O (g) + 3OF2 (g) delta H = 394.1